Utter Abuse

I settled my FNB Revolving loan Account with Connack and Muller & Co on 18 August 2021 i received the settlement letter. It is now 28th October 2021, FNB has not processed any of the documents sent to them that reflect that i have settled this account. On all MY ITC checks it shows that I have not been paying this account. What more must I do?? I have paid the account and want to continue with my life but FNB refuses to update their records to show that I don't owe them for this Account. FNB states that they only received my documents from CONNACK and Muller in mid September...I have been calling Adele from Connack and Muller asking her what is holding up the process and she has been adamant that my documents were sent to FNB in September and were just lying and gathering dust.